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Coupled Mode Flutter of a Linear Compressor Cascade in Subsonic and Transonic Flow Conditions

Schuff, Matthias and Chenaux, Virginie (2020) Coupled Mode Flutter of a Linear Compressor Cascade in Subsonic and Transonic Flow Conditions. In: Proceedings of the 18th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, ISROMAC18. ISROMAC 2020 - 18th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, 23.-26. Nov. 2020, Online-Conference.

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Abstract

Flutter onset in turbomachinery is typically investigated numerically via decoupled methods due to a high mass ratio of structure to air. The unsteady aerodynamic response of a forced motion vibration is evaluated for a positive or negative work entry. The forced motion simulations assume vacuum mode shape vibrations at certain amplitudes without modal coupling due to aerodynamic forces. This approach, also known as the energy method, is valid for a high blade mass ratio and small logarithmic decrement values. An aeroelastic study of a multi-passage linear compressor cascade was performed. In fluid-structure-coupled time-marching CFD, generic heave and pitch degrees of freedom are allowed to vibrate freely in reaction to any aerodynamic forces. For one subsonic and one transonic flow condition predicted to be stable by the classical energy method approach, aerodynamically coupled-mode flutter is observed. It is shown that variations in the starting conditions, i.e. the initial vibration and inter-blade phase angle of the system, can have a strong influence on the number of CFD iterations required until amplitudes grow. However, if coupled-mode flutter is present in the system, it will ultimately set in at a distinct inter-blade phase angle.

Item URL in elib:https://elib.dlr.de/137467/
Document Type:Conference or Workshop Item (Speech)
Title:Coupled Mode Flutter of a Linear Compressor Cascade in Subsonic and Transonic Flow Conditions
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Schuff, MatthiasMatthias.Schuff (at) dlr.dehttps://orcid.org/0000-0003-3276-2539
Chenaux, VirginieVirginie.Chenaux (at) dlr.deUNSPECIFIED
Date:November 2020
Journal or Publication Title:Proceedings of the 18th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, ISROMAC18
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:turbomachinery, compressor, aeroelasticity, vibration, damping, flutter, coupled mode, mass ratio, lightweight
Event Title:ISROMAC 2020 - 18th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery
Event Location:Online-Conference
Event Type:international Conference
Event Dates:23.-26. Nov. 2020
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation methods (old)
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Aeroelastic Experiments
Deposited By: Schuff, Matthias
Deposited On:24 Nov 2020 18:31
Last Modified:24 Nov 2020 18:31

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